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Commit 4afba24e authored by David S. Miller's avatar David S. Miller
Browse files

sparc64: Skip bogus PCI bridge ranges. 



It seems that when a PCI Express bridge is not in use and has no devices
behind it, the ranges property is bogus.  Specifically the size property
is of the form [0xffffffff:...], and if you add this size to the resource
start address the 64-bit calculation will overflow.

Just check specifically for this size value signature and skip them.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 93a6423b

arch/sparc/kernel/pci.c

+11 −0
Original line number Diff line number Diff line
@@ -489,6 +489,17 @@ static void of_scan_pci_bridge(struct pci_pbm_info *pbm, 
		size = GET_64BIT(ranges, 6);

		if (flags == 0 || size == 0)

			continue;



		/* On PCI-Express systems, PCI bridges that have no devices downstream

		 * have a bogus size value where the first 32-bit cell is 0xffffffff.

		 * This results in a bogus range where start + size overflows.

		 *

		 * Just skip these otherwise the kernel will complain when the resource

		 * tries to be claimed.

		 */

		if (size >> 32 == 0xffffffff)

			continue;



		if (flags & IORESOURCE_IO) {

			res = bus->resource[0];

			if (res->flags) {